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In a Millikan-type experiment, an oil droplet of mass 3.7x10^-18 is suspended between two horizontal parallel...

In a Millikan-type experiment, an oil droplet of mass 3.7x10^-18 is suspended between two horizontal parallel plates when the potential difference between the plates is 4.50 V and they are 4.0 cm apart. The upper plate is positive.

a) Is the sphere positively or negatively charged? Explain.

b) Calculate the magnitude of charge on the sphere.

c) How much excess or deficit of electrons does the sphere have? (State whether is is excess or deficit.)

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